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BRISTOL, Conn., June 7, 2001 (NYSE: NU) – Yankee Gas Services Company will replace approximately 2,680 feet of natural gas mains and related gas services in Bristol beginning next week. Construction is expected to take approximately five to six weeks to complete. The main replacement project is part of Yankee’s annual program to upgrade its distribution system. The purpose of this program is to constantly improve its system so that customers continue to receive the safe and reliable service they expect from Yankee. “We realize this construction activity will inconvenience some residents and businesses and we apologize for that. We’ll be doing this as expeditiously and safely as we can. We also will be replacing the gas services – these are the lines that run from the mains to their homes or businesses – to our customers along the way. We’ll do this free of charge, at their convenience,” said Christopher, L. Beschler, vice president of Operations for Yankee Gas. “This main replacement project is an important part of our ongoing annual system reliability program and we believe it will allow us to better serve this growing community, once it’s complete.” Yankee Gas customers will be contacted to coordinate replacement of their gas services. The following streets are scheduled for gas main replacement in Bristol:· George Street· Carlson Street· Murray Street

“This effort also presents a great opportunity for anyone along the route of this

construction project to convert to natural gas, since construction crews will be working in the area,” added Beschler. Anyone interested in switching to natural gas can call Yankee’s Business Response Center at 1-888-2Yankee.

Yankee Energy System, Inc., (YES) which is part of the Northeast Utilities System, includes Yankee Gas Services Company, the largest natural gas distribution company in Connecticut serving approximately 187,000 customers in 69 cities and towns throughout the state. Yankee Energy also includes Yankee Energy Financial Services Company, which provides a full range of residential and commercial energy equipment financing options. Further information about YES can be obtained from its web site: www.yankeeenergy.com